The tempering temperature for a razor, as I understand it, should be around 400 F. This would give you somewhere between 58 to 62 Rockwell. As I understand it, razors should be harder than a knife, but not untempered. If you don't temper it, it would shatter if you hit it with anything, or drop it. I am a beginner at all this, but I have an excellent teacher. Three successful razors, so far, and 3 more in process.